  

import { defineComponent, ref, inject } from 'vue'
import Styles from './dag.module.scss'
import { useCanvasInit, useCellActive } from './dag-hooks'

export default defineComponent({
  name: 'workflow-dag-canvas',
  emits: ['drop'],
  setup(props, context) {
    const readonly = inject('readonly', ref(false))
    const graph = inject('graph', ref())

    const { paper, minimap, container } = useCanvasInit({ readonly, graph })

    // Change the style on cell hover and select
    useCellActive({ graph })
    const preventDefault = (e: DragEvent) => {
      e.preventDefault()
    }

    return () => (
      <div
        ref={container}
        class={[Styles.canvas, 'dag-container']}
        onDrop={(e) => {
          context.emit('drop', e)
        }}
        onDragenter={preventDefault}
        onDragover={preventDefault}
        onDragleave={preventDefault}
      >
        <div ref={paper} class={Styles.paper}></div>
        <div ref={minimap} class={Styles.minimap}></div>
      </div>
    )
  }
})
